<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			/* html {
				font-size: 30px;
			} */

			@media screen and (min-width:500px) {
				html {
					font-size: 50px;
				}
			}

			@media screen and (min-width:800px) {
				html {
					font-size: 10px;
				}
			}

			div {
				height: 6.25rem;
				font-size: 3.125rem;
				background-color: orange;
			}
		</style>
	</head>
	<body>
		<div>博为峰</div>
	</body>
</html>
